<template>
  <div id="app">
    <router-view />
  </div>
</template>

<script>
const version = require('element-ui/package.json').version;
export default {
  name: 'app',
  watch: {
    '$store.getters.theme'(val) {
      const oldVal = !val || val === '' ? '#409EFF' : val;
      if (typeof val !== 'string') return;
      const themeCluster = this.getThemeCluster(val.replace('#', ''));
      const originalCluster = this.getThemeCluster(oldVal.replace('#', ''));

      let style_els = document.getElementsByTagName('style');
      style_els.forEach((style, index) => {
        let { innerText } = style;

        const originalCluster = ['000001', 'fffffe', 'f907a4'];
        const userDefinedCluster = [val.replace('#', ''), '555555', val.replace('#', '')];
        let newStyle = this.updateStyle(innerText, originalCluster, userDefinedCluster);
        style.innerText = newStyle;
      });

      const getHandler = (variable, id) => {
        return () => {
          const originalCluster = this.getThemeCluster('#409EFF'.replace('#', ''));
          const newStyle = this.updateStyle(this[variable], originalCluster, themeCluster);

          let styleTag = document.getElementById(id);
          if (!styleTag) {
            styleTag = document.createElement('style');
            styleTag.setAttribute('id', id);
            document.head.appendChild(styleTag);
          }
          styleTag.innerText = newStyle;
        };
      };

      const chalkHandler = getHandler('chalk', 'chalk-style');

      if (!this.chalk) {
        const url = `https://unpkg.com/element-ui@${version}/lib/theme-chalk/index.css`;
        this.getCSSString(url, chalkHandler, 'chalk');
      } else {
        chalkHandler();
      }

      const styles = [].slice.call(document.querySelectorAll('style')).filter(style => {
        const text = style.innerText;
        return new RegExp(oldVal, 'i').test(text) && !/Chalk Variables/.test(text);
      });

      styles.forEach(style => {
        const { innerText } = style;
        if (typeof innerText !== 'string') return;
        style.innerText = this.updateStyle(innerText, originalCluster, themeCluster);
      });
    }
  },
  created() {
    this.$store.dispatch('user/getCodeValue');
    this.$store.commit('themeAndLanguage/initTheme');
    this.$store.commit('themeAndLanguage/initLanguage');
  },
  mounted() {},
  methods: {
    updateStyle(style, oldCluster, newCluster) {
      let newStyle = style;
      // console.info("newStyle ", newStyle);
      oldCluster.forEach((color, index) => {
        newStyle = newStyle.replace(new RegExp(color, 'ig'), newCluster[index]);
      });
      return newStyle;
    },

    getCSSString(url, callback, variable) {
      const xhr = new XMLHttpRequest();
      xhr.onreadystatechange = () => {
        if (xhr.readyState === 4 && xhr.status === 200) {
          this[variable] = xhr.responseText.replace(/@font-face{[^}]+}/, '');
          callback();
        }
      };
      xhr.open('GET', url);
      xhr.send();
    },

    getThemeCluster(theme) {
      const tintColor = (color, tint) => {
        let red = parseInt(color.slice(0, 2), 16);
        let green = parseInt(color.slice(2, 4), 16);
        let blue = parseInt(color.slice(4, 6), 16);

        if (tint === 0) {
          // when primary color is in its rgb space
          return [red, green, blue].join(',');
        } else {
          red += Math.round(tint * (255 - red));
          green += Math.round(tint * (255 - green));
          blue += Math.round(tint * (255 - blue));

          red = red.toString(16);
          green = green.toString(16);
          blue = blue.toString(16);

          return `#${red}${green}${blue}`;
        }
      };

      const shadeColor = (color, shade) => {
        let red = parseInt(color.slice(0, 2), 16);
        let green = parseInt(color.slice(2, 4), 16);
        let blue = parseInt(color.slice(4, 6), 16);

        red = Math.round((1 - shade) * red);
        green = Math.round((1 - shade) * green);
        blue = Math.round((1 - shade) * blue);

        red = red.toString(16);
        green = green.toString(16);
        blue = blue.toString(16);

        return `#${red}${green}${blue}`;
      };

      const clusters = [theme];
      for (let i = 0; i <= 9; i++) {
        clusters.push(tintColor(theme, Number((i / 10).toFixed(2))));
      }
      clusters.push(shadeColor(theme, 0.1));

      return clusters;
    }
  }
};
</script>
<style lang="scss">
.el-page-header__content {
  font-size: 16px !important;
}
.jsoneditor-poweredBy {
  display: none;
}
.jsoneditor-modes {
  display: none;
}
</style>
